Chapman, Robert L., author
London Pan Books 1988
Buku Referensi
Fergusson, Rosalind, author
Routledge, 1994
Buku Referensi
Green, Jonathon, author
Cassell & Co, 2000
Buku Referensi
Buku Referensi
edited by Catherine Soanes and Angus Stevenson
Oxford University Press, 2006
Buku Referensi